Towards optimized carbon nanotubes (CNTs) reinforced polyetherimide (PEI) 3D printed structures: A comparative study on testing standards. (15th September 2022)

• Record Type: Journal Article
• Authors: Yıldız, Alptekin; Emanetoğlu, Uğur; Yenigun, Elif Ozden; Cebeci, Hulya
• Is Part Of: Composite structures. Volume 296(2022)
• Publication Date: 2022-09-15
• Subjects: Carbon nanotubes -- PEI nanocomposite -- Additive manufacturing -- Mechanical properties and standards -- Multifunctionality; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2022.115853
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: Tailoring the properties of high-performance polymers through reinforcing will bring multifunctionality and expand their use in additive manufacturing (AM). However, machine and material-based challenges exist, eventually resulting in low-quality end products. When expensive polymers are considered, it is still challenging to tailor their properties and print them for high-quality multifunctional structures. Here, polymer composites of polyetherimide (PEI) and carbon nanotubes (CNTs) with varying CNT weight fractions are produced in filament form by melt-processing. Neat PEI, 1 wt% and 3 wt% CNTs/PEI are additively manufactured in two different raster orientations ( Rectilinear and Concentric ), and two most proposed testing geometries, ASTM D638 and D3039. Through effective melt-processing, CNTs-reinforced PEI filaments were achieved, printing parameters and testing protocols were discussed. As a result, ASTM D3039 showed superior coherence with filaments' mechanical properties. Moreover, based on failure modes, ASTM D3039 provided better compatibility to AM, owing to its simple rectangular form yielding well-adhered layers.